CN101907479A

CN101907479A - Fine adjustment mechanism for crank of diaphragm gas meter

Info

Publication number: CN101907479A
Application number: CN 201010212008
Authority: CN
Inventors: 熊朝文; 张敬鎕
Original assignee: Chongqing Shancheng Gas Equipment Co Ltd
Current assignee: Chongqing Shancheng Gas Equipment Co Ltd
Priority date: 2010-06-29
Filing date: 2010-06-29
Publication date: 2010-12-08
Anticipated expiration: 2030-06-29
Also published as: CN101907479B

Abstract

The invention relates to a fine adjustment mechanism for a crank of a diaphragm gas meter, which is characterized by comprising a crank, a crank disc, a crank stand, a fine adjustment pointer for radial movement of the crank, and a fine adjustment pointer for rotation of the crank, wherein the crank rotation angle and the crank radius of a crank set can be respectively adjusted independently and generate synergistic action to finely adjust the basic error and the error curve of a clock mechanism, thereby obviously improving the metrological characteristics of the diaphragm gas meter. By adopting the structure, the invention has the characteristics of few parts, compact structure, low cost, simple and convenient adjusting operation, excellent performance and the like.

Description

Fine adjustment mechanism for crank of diaphragm gas meter

Technical field

Patent of the present invention relates to a kind of fine adjustment mechanism of diaphragm gas meter meter characteristic, is a type of crank group.

Background technology

Diaphragm gas meter is the measuring apparatus that a kind of revolution volume that utilizes the flexible diaphragm in the measuring room is measured the combustion gas volume.

The metering units of diaphragm gas meter is four measuring rooms that are separated into by flexible diaphragm in rigidity measuring room body.The measuring room air inlet is exactly the combustion gas that absorbs the gas meter, flow meter upstream; It is exactly to gas meter, flow meter downstream delivery of fuel gas that measuring room is given vent to anger.This process is exactly the basis of realizing gas metering.Four measuring rooms are finished an air inlet successively and are given vent to anger and just constitute a revolution volume.By the four-bar mechanism and coupling, the coupling of four measuring rooms that diaphragm drives, the process of gas meter, flow meter continuous measurement is set up in the realization continual air inlet of measuring room and giving vent to anger.The valve port that the air inlet of measuring room or give vent to anger is made up of valve grid, valve gap switches.And the valve port switching is to be controlled by the control gear that diaphragm drives.If valve port switches the upset of " in advance " diaphragm at extreme position, the slope of the graph of errors of diaphragm gas meter will reduce; Otherwise the slope of graph of errors will strengthen.Obviously, if the slope of graph of errors is more little, the revolution volume is accurate more, and the precision of diaphragm gas meter is just high more so.No matter volume is measured and turned round to " in advance " is handled how accurately in every kind of diaphragm gas meter design, the error that all unavoidably make, assembling etc. causes.In order to realize the design object of diaphragm gas meter, just should eliminate these errors, this just needs to adopt the error micro-adjusting mechanism.The crank of diaphragm gas meter adjusting mechanism that can see on the market can reduce three types: first kind of simple pointer formula, use amount maximum; Second kind of two pointer-type, use amount is very rare, only sees in the big flow diaphragm gas meter of indivedual models that Germany produces; The third simple pointer and discrete crank-type, use amount is little." in advance " amount was both finely tuned in the first kind of angle of revolution that can only finely tune crank; Second kind because crank and crank disc are as a whole, do not have essential distinction with simple pointer; The third crank is discrete.Crank angle, radius are regulated respectively.But the crank length stepping is regulated, and step pitch is very thick, and it is more loaded down with trivial details to adjust operation, adjusts effect and also is restricted.

Summary of the invention

The purpose of this invention is to provide a kind of fine adjustment that can realize core of membrane type gas meter error and graph of errors.

The technical scheme that realizes above-mentioned purpose and adopt is such, and promptly a kind of membrane type fine adjustment mechanism for crank of diaphragm gas meter is characterized in that by crank, crank disc, crank base, and crank moves radially the fine setting pointer and crank rotates fine setting pointer composition; Wherein:

Crank top is positioned at the radially cylindrical void of crank disc;

The lower end that crank moves radially the fine setting pointer has biasing post on round boss and the boss, the boss that crank moves radially fine setting pointer lower end passes the uniform thickness groove that through hole corresponding on the crank disc falls into crank bottom correspondence, and biasing post is arranged in the bar hole of described bottom portion of groove;

The lower end of crank rotation fine setting pointer has the biasing post on round boss and the boss, and the through hole that the boss of crank rotation fine setting pointer lower end passes crank disc and crank bottom correspondence makes biasing post be arranged in the bar hole of crank base correspondence;

In the edge clamping, crank top is positioned in the radially cylindrical void of crank disc between crank disc and the crank base; Horizontally rotate crank move radially the fine setting pointer can allow crank to move along the crank base radius; Horizontally rotating crank rotation fine setting pointer can allow crank to rotate around the crank base axis with crank disc.

The present invention rotates around the axis of crank base owing to said structure allows crank to follow crank disc; Allow crank moving radially: realize the meticulous adjustment of core of membrane type gas meter error and graph of errors with this along crank base; Two fine settings can be convenient to bring into play their synergy respectively, can significantly promote the meter characteristic of diaphragm gas meter.

The present invention has: part is few, and compact conformation is with low cost, adjust easy and simple to handle, characteristics such as excellent performance.

Above-mentioned fine adjustment mechanism for crank of the present invention is contained on the camshaft by crank base, is connected with the dead man gear set by cam wheel, again by the magnetic coupling transmission, rotates through gear set drive counter character wheel.

Crank length is a link of the four-bar mechanism of diaphragm driving.Under the fixed situation of four-bar mechanism, rocking arm, crank, these three movable rod members of pull bar all may change the diaphragm stroke within the specific limits, have both finely tuned the revolution volume of diaphragm gas meter.The sensitivity of its effect is according to the series arrangement of rocking arm, crank, pull bar.Because core of membrane type gas meter has two cover four-bar mechanisms related with two diaphragms respectively.Therefore the shared crank of two cover four-bar mechanisms finely tunes the stroke of crank with regard to fine-tuning two diaphragms, has both finely tuned the revolution volume of diaphragm gas meter, does not also need to finely tune the coupling of two cover four-bar mechanisms.Simplify, flexibly.

The fine setting of crank angle is related with " in advance " that valve port switches, can adjust the slope of graph of errors.When the fine setting crank angle changes diaphragm gas meter graph of errors slope, also can change the position of graph of errors in coordinate system a little, both have the effect of the revolution volume that changes diaphragm gas meter.

Obviously, give full play to the synergy of two fine settings of crank of diaphragm gas meter micro-adjusting mechanism, error and graph of errors that just can meticulous adjustment core of membrane type gas meter, thus significantly improve the meter characteristic of diaphragm gas meter.And the rotation of crank, mobile meticulous step pitch and fine setting scope thereof, by affiliated diaphragm gas meter characteristic decision.

Description of drawings

Accompanying drawing 1 is the assembling synoptic diagram of structure of the present invention;

Accompanying drawing 2 is a structure cut-open view of the present invention;

Accompanying drawing 3,4,5 is the synoptic diagram of three kinds of form crank discs of the present invention;

Accompanying drawing 6 is the preceding graph of errors of collaborative fine setting;

Accompanying drawing 7,8 is for working in coordination with the graph of errors after finely tuning.

Among the figure: the 1-crank; The 2-crank disc; The 3-crank base; The 4-crank moves radially the fine setting pointer; The 5-crank rotates the fine setting pointer.

Embodiment

Referring to accompanying

drawing

1,2, the fine adjustment mechanism for crank of diaphragm gas meter among the figure is characterized in that by crank 1, crank disc 2, crank base 3, and crank moves radially fine setting pointer 4 and crank rotates fine setting pointer 5 compositions; Wherein: crank 1 top is positioned at the radially cylindrical void of crank disc 2; The lower end that crank moves radially fine setting pointer 4 has biasing post on round boss and the boss, the boss that crank moves radially fine setting pointer 4 lower ends passes the uniform thickness groove that through hole corresponding on the crank disc 2 falls into crank bottom correspondence, and biasing post is arranged in the bar hole of described bottom portion of groove; The lower end of crank rotation fine setting pointer 5 has the biasing post on round boss and the boss, and the through hole that the boss of crank rotation fine setting pointer 5 lower ends passes crank disc 2 and crank bottom correspondence makes biasing post be arranged in the bar hole of crank base 3 correspondences; Buckle is connected between crank disc 2 and the crank base 3, crank top is positioned in the radially cylindrical void of crank disc; Horizontally rotate crank move radially the fine setting pointer 4 can allow crank to move along the crank base radius; Horizontally rotating crank rotation fine setting pointer 5 can allow crank to rotate around the crank base axis with crank disc.

Accompanying drawing provides among the embodiment, above-mentioned crank disc 2 is an one by the inside draw-in groove in edge, lower end and the edge buckle of crank base 3, draw-in groove described in Fig. 1 has three breach, the edge of crank base 3 has the chimb of three described breach correspondences in territory, and described chimb rotates into described draw-in groove by described breach and realizes that the buckle of two parts connects.

Above-mentioned crank moves radially round boss that fine setting pointer 4 and crank rotate fine setting pointer 5 lower ends and is stuck in the bayonet socket corresponding on the crank disc 2 (locking and do not extracted easily), is marked with equi-distance scale on the rotational trajectory of pointer on the crank disc.

Referring to accompanying drawing 3-5, present situation such as crank disc of the present invention can circle, sub-circular, the radially cylindrical void on the crank disc is arranged on the radial line of passing the crank disc geometric center.

Referring to accompanying drawing 6, do not working in coordination with the graph of errors of measuring before the fine setting with No. 15, No. 16, No. 17 and No. 18 four G25 diaphragm gas meters, poor, the dispersion of curve conformity as can be seen among the figure, thereby defective.

Referring to accompanying drawing 7,16-20 number and No. 22 and No. 24 7 G25 diaphragm gas meters present consistance preferably after by collaborative fine setting, but rate of curve is bigger.

Later present good consistance referring to 8, two G25 diaphragm gas meters of accompanying drawing by collaborative fine setting, but rate of curve is less.

Claims

1. fine adjustment mechanism for crank of diaphragm gas meter is characterized in that by crank (1), crank disc (2), crank base (3), and crank moves radially fine setting pointer (4) and crank rotates fine setting pointer (5) composition; Wherein:

Crank (1) top is positioned at the radially cylindrical void of crank disc (2);

The lower end that crank moves radially fine setting pointer (4) has biasing post or driving lever on round boss and the boss, the boss that crank moves radially fine setting pointer (4) lower end passes the uniform thickness groove that the upward corresponding through hole of crank disc (2) falls into crank bottom correspondence, and biasing post or driving lever are arranged in the bar hole of described bottom portion of groove;

The lower end of crank rotation fine setting pointer (5) has biasing post or the driving lever on round boss and the boss, and the through hole that the boss of crank rotation fine setting pointer (5) lower end passes crank disc (2) and crank bottom correspondence makes biasing post or driving lever be arranged in the corresponding bar hole of crank base (3);

Buckle is connected between crank disc (2) and the crank base (3), crank top is positioned in the radially cylindrical void of crank disc; Horizontally rotate crank move radially the fine setting pointer (4) can allow crank to move along the crank base radius; Horizontally rotating crank rotation fine setting pointer (5) can allow crank to rotate around the crank base axis with crank disc.

2. fine adjustment mechanism for crank of diaphragm gas meter according to claim 1 is characterized in that: described crank disc (2) is an one by the inside draw-in groove in edge, lower end and the edge buckle of crank base (3).

3. fine adjustment mechanism for crank of diaphragm gas meter according to claim 1, it is characterized in that: the round boss that described above-mentioned crank moves radially fine setting pointer (4) and crank rotation fine setting pointer (5) lower end is stuck in the upward corresponding bayonet socket of crank disc (2), is marked with equi-distance scale on the rotational trajectory of pointer on the crank disc.